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Bulgaria BDS 55S2A Spring steels. Designations and technical requirements and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 55S2A / 55 S 2 A
Category Grade Standard Region/Area Standard Content
Metals 55 S 2 A BDS 6742 Bulgaria Spring steels. Designations and technical requirements

Chemical composition(mass fraction)(wt.%) of the 55 S 2 A

Element Min Max Similar

Mechanical Properties of steel grade 55 S 2 A

Yield
Rp0.2 (MPa)
Tensile
Rm (MPa)
Impact
KV/Ku (J)
Elongation
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
874 (≥) 716 (≥) 32 12 21 Solution and Aging, Annealing, Ausaging, Q+T,etc 342

Physical Properties of steel grade 55 S 2 A

Temperature
(°C)
Modulus of elasticity
(GPa)
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)
Specific thermal capacity
(J/kg·°C)
Specific electrical resistivity
(Ω mm²/m)
Density
(kg/dm³)
Poisson’s coefficient, ν
33 - -     0.43 -  
558 668 - 32.3 431   -  
834 - 41 31.2   232 432

Heat Treatment of steel grade 55 S 2 A

Heat treated : 1348°C - 1674°C

Technological Curves of steel grade 55 S 2 A

Cross Reference Table (Equivalent Grade) of 55 S 2 A

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